APA-čujuhus (7. p.)
The Complete National Geographic: 109 Years of National Geographic Magazine on CD-ROM.
Chicago-čujuhus (17. p.)
The Complete National Geographic: 109 Years of National Geographic Magazine on CD-ROM.
MLA-čujuhus (9. p.)
The Complete National Geographic: 109 Years of National Geographic Magazine on CD-ROM.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.